Today's Yun Ye is no longer the solitary time traveler he was a few years ago.

He was the Marquis of Lantian in the Tang Dynasty, who was promoted to a higher title for his merits and saved countless lives. Among all the officials in the court, the only two who could act like elders in front of him were Cheng Yaojin and Niu Jinda, whom he regarded as elders from the bottom of his heart.

Although Li Jing was the chief steward of Dingxiang Road, he was not Yun Ye's direct superior after all.

In addition, the two of them had some unpleasantness because of the matter of Hong Fu Nu and Qiu Ran Ke. This time he needed a favor from Yun Ye, so Li Jing could only meet Yun Ye honestly with the etiquette of host and guest.

Yun Ye was not pretentious. He knew the pros and cons of the matter.

Since this is a matter of military importance, he cannot afford to show off his personal temper.

What's more, the person who came to invite on behalf of Li Jing was Sun Simiao, whom Yun Ye respected very much, which made it even more impossible for Yun Ye to refuse.

"I never thought that Li Jing actually had a personal relationship with Taoist Sun..."

On the way to the tent, Yun Ye complained in a low voice to Lin Zhongtian beside him.

Lin Zhongtian smiled and said nonchalantly: "Although Taoist Sun is now over 80 years old, Li Jing is also nearly 60 years old. Both of them have been famous for many years and have been in the martial arts world. It is normal for them to have some interactions."

Yun Ye thought about it and nodded, "That's right. It's the fourth year of Zhenguan now. In another year, Li Jing will be sixty years old. So, he is only about a generation older than Taoist Sun..."

“Ahem!”

Hearing Yun Ye and Lin Zhongtian chatting as if no one was around, the general leading the way couldn't help but cough.

Yun Ye glanced at his back, curled his lips, and stopped talking about Li Jing with Lin Zhongtian behind his back.

Soon, the two entered the military tent where Li Jing was.

Lin Zhongtian walked half a step ahead of Yun Ye and saw an old man with a solemn expression sitting behind the desk with a pile of documents in front of him. He looked at them scrutinizingly with a pair of old but clear eyes.

"Are you Yun Ye's senior brother?"

Li Jing stared at Lin Zhongtian and took the lead in asking questions to this immortal disciple whom he had never seen before.

Lin Zhongtian smiled, bowed casually and said: "Lin Zhongtian greets the chief steward of Dingxiang Road. I am a man from the countryside and don't know the etiquette. If I have offended you in any way, I hope the chief steward will forgive me..."

Seeing that Lin Zhongtian was as rude as Sun Simiao said, Li Jing couldn't help but curl his lips.

"No problem." He waved his hand and said, "The son of a master is naturally extraordinary. Little friend Lin, there is no need to be polite. I will allow you to do whatever you want!"

After these words were spoken, Lin Zhongtian and Yun Ye did not react at all, but the general who led the way breathed a sigh of relief first.

There was no way. Along the way, the pressure brought to him by Lin Zhongtian's gaze was too great.

The last time he felt this way was the battle in front of Xuanwu Gate that almost cost him his life...

Hearing Li Jing's words, Lin Zhongtian was a little surprised and raised his hand and said, "Thank you, Chief Steward."

Yun Ye smiled slightly, stepped forward and bowed, saying: "Reporting to the chief steward, the forgers of the documents are a group of horse thieves, the leader is called Yetuo, and there is a strong force behind him."

"As for who they are, I don't know yet, but I can conclude that they are all extremely talented and should not be underestimated!"

Li Jing shook his head: "I have also heard of Yetuo, but he is just an unknown person in Kangguo. Since he dares to attack my army, how can I let him live!"

"As a soldier of the Tang Dynasty, why should I take a small bandit seriously? After I defeat DTZ, I will go to Kangguo to see how bold this bandit is to dare to commit such a rebellious act in front of our army!"

"As for now, I called you two brothers here for another matter."

As he spoke, Li Jing picked up the forged order in front of him and sighed, "Although Yetuo is a minor figure, his forgery of the document has exposed the shortcomings of our army in conveying military orders."

"What I am worried about is the Yin Talisman used for military communications. Since the other party was able to forge a transfer order, it means that the Yin Talisman has been leaked. I want to improve the Yin Talisman, but I don't know where to start..."

After saying this, Li Jing turned his gaze towards Yun Ye and Lin Zhongtian, and the implication of his words was already evident.

The general who led the way did not leave the tent. Instead, he stood beside the table, also looking at the two of them with a sharp gaze.

Seeing this scene, Yun Ye knew very well that the general leading the way was definitely not an ordinary person. He might be the leader of the Hundred Cavalry Division in the army, that is, the head of the secret service agency directly under Emperor Li Er.

Yun Ye winked at the angel in the forest, then patted his chest and said confidently: "How difficult is this!"

"I have heard Mr. Xu talk about the Yin Fu and Yin Shu methods a long time ago. These things have been passed down for thousands of years since Jiang Taigong. They sound like some sophisticated means of communication, but in my opinion, they are just some crude tricks!"

"Bamboo joints for communication, hiding the head and showing the tail, jumping every three seconds, these are all old tricks of our ancestors."

"The fact that the chief steward asked for advice on this matter actually made me a little confused. Why has the Tang army not made any improvements over the years? Why are they still using these same old tricks?"

As soon as such complacent words came out, the faces of the generals in front of Li Jing's desk suddenly changed.

He glared at Yun Ye and said, "You are ignorant, my Hundred Cavalry Division—"

Before he finished speaking, Lin Zhongtian's sharp gaze came over, and an invisible sense of oppression burst out of nowhere, causing Li Jing and the leader of the Hundred Cavalry Division in the tent to be shocked, and they looked at Lin Zhongtian with serious faces.

Yun Ye's heart skipped a beat, and he quickly stopped Lin Zhongtian: "Brother, calm down, we are all family, don't be impulsive."

After saying that, he turned his head, looked at Li Jing and said with a smile: "General Manager, and this general..."

The general looked at Lin Zhongtian solemnly and said slowly: "I am Hong Cheng."

Yun Ye nodded and said, "General Hong Cheng, if you don't believe me, then let's use facts to speak for ourselves. Chief Steward, if I am a spy now, please pass on a military order and let me write a secret letter to see if General Hong of the Hundred Cavalry Division can figure it out!" Hong Cheng turned his gaze to Yun Ye again and frowned, "Okay, let's try!"

Li Jing also became interested and immediately wrote down a military order and handed it to Yun Ye.

After Yun Ye took it, he nodded, took out a book from his arms, and read it leisurely, writing something on the paper from time to time.

After a while, under the puzzled gazes of Li Jing and Hong Cheng, Yun Ye put down his pen, stretched, and handed the secret letter to Hong Cheng.

Hong Cheng couldn't wait to take it, and looked at it from left to right, but he could only see some illogical capital numbers. He had no idea what these numbers meant.

“…Is this the Yin Fu book you wrote?”

Hong Cheng suppressed his anger, as if saying, "Are you kidding me?"

Yun Ye smiled and said, "How about it, can't you tell?"

Li Jing looked at the numbers on the Yin Fu Book, pondered for a moment, and turned to look at Lin Zhongtian.

"Little friend Lin, maybe you can understand?"

Lin Zhongtian had already understood Yun Ye's actions, and immediately smiled and nodded, saying, "If you have the code book, of course you can!"

Li Jing was slightly startled: "Code book?"

Yun Ye and Lin Zhongtian looked at each other and smiled slightly. Everything was said without words.

He handed the book to Lin Zhongtian, who took it, compared it with the numbers on the Yin Fu Book, turned to the corresponding pages and lines, and wrote down the corresponding words one by one.

Soon, a deciphered secret letter appeared in front of Li Jing.

"At 4am tomorrow, we will prepare dinner. At 5am, the whole army will set out. The Cavalry Battalion will be on the left, the Modao Battalion will be the rear guard, and the scouts will be sent out 15 miles. Order Li Ji to ambush troops at the mountain pass. When half of the enemy has passed, attack from the middle and cut the enemy into two. This order is from the General Manager Li Jing, and will be issued on January 16th."

After reading it, Li Jing suddenly looked up and looked at the two of them with sharp eyes.

Hong Cheng was astonished. If he had not seen it with his own eyes, he would never have imagined that the Yin Fu Book filled with numbers could accurately translate the military orders conveyed by Li Jing.

Yun Ye said leisurely: "Now that things have come to this, the chief steward should have understood it, right?"

Li Jing said with a sharp gaze: "The secret is in that so-called code book!"

Yun Ye smiled and handed the book over, saying, "This book was written by me in the past three days. It contains various words commonly used in military orders. When writing the Yin Fu Book, you only need to fill in the numbers according to the corresponding pages and lines. The person who receives the secret order can then reversely decipher it against the code book and get accurate instructions."

Li Jing took the code book and couldn't wait to compare it with the Yin Fu Book and translate his military order again.

After receiving the code, Li Jing couldn't help but exclaim in admiration, saying, "It's really ingenious. This way, our army won't have to worry about the messenger being intercepted midway. However, this method requires the absolute confidentiality of the code book, and it's best to change it from time to time..."

Yun Ye was slightly startled, and then he praised: "The chief steward is indeed smart and can draw inferences from one example!"

After he finished speaking, he stretched himself and glanced at the pale-faced Hong Cheng next to him and said, "Of course, I am just proposing a draft. The subsequent compilation and confidentiality of the code book will still be handed over to the chief steward and the Hundred Cavalry Division."

“It should be so.”

Li Jing nodded, then glanced at Hong Cheng and said, "Why don't you thank Lord Yun quickly?"

Hong Cheng's face flushed, and he suddenly lifted up his robe, knelt on one knee, and bowed deeply to Yun Ye.

Yun Ye was startled by his actions and quickly raised his hand to support Hong Cheng.

But unfortunately, how could his strength be compared with that of a general like Hong Cheng? Lin Zhongtian just waved his sleeves and lifted Hong Cheng up with the force attached to his sleeves.

Such an exquisite method made Li Jing and Hong Cheng look surprised.

After coming back to his senses, Li Jing said softly, "Although Hong Cheng is the leader of the Hundred Cavalry Division, he is actually a retainer of your majesty. The military secrets were leaked and the transfer order was tampered with. He is more anxious than anyone else. Yun Hou put aside the past grudges and offered this plan, which saved his life. He deserves such a great gift."

I see……

Yun Ye suddenly realized.

Hong Cheng's face flushed and he lowered his head towards the boy in front of him who was much younger than him.

"Please teach me, Lord Yun!"

Yun Ye was slightly startled and asked in surprise: "Didn't I already teach you everything?"

Hong Cheng lowered his head, his face full of shame.

Yun Ye reacted and couldn't help but sigh, and was deeply worried about the overall quality of the Tang Dynasty's intelligence organization.

But there is no way, this is how the family empire works. For a secret agency like the Hundred Cavalry Division that is directly under the emperor, the position of its leader has always been based on personal loyalty, not personal ability.

Yun Ye's explanation was so thorough that Li Jing could draw inferences about other situations. However, Hong Cheng still didn't understand, which made him speechless.

But on the other hand, Hong Cheng is so stupid, but he can still serve as the head of the Hundred Cavalry Division, which shows how much trust Li Er has in him.

Thinking of this, Yun Ye smiled slightly, helped Hong Cheng up, and comforted him: "Don't worry, General Hong, it will take some time for Yun to return to Chang'an, we have plenty of time..."